Meaning of 'to give somebody a piece of my mind'

[zuzka]

English Language Tests, Intermediate level

ESL/EFL Test #58 "Lots of Pieces", question 6

Charlie decided he would say exactly what he thought of the burglar and give him a piece of his ..........

(a) thoughts
(b) brain
(c) thinking
(d) mind

English Language Tests, Intermediate level

ESL/EFL Test #58 "Lots of Pieces", answer 6

Charlie decided he would say exactly what he thought of the burglar and give him a piece of his mind.

Correct answer: (d) mind
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Hi,
I am about to solve this question, but I'm stuck.
What does it mean to give somebody a piece of my mind, ...maybe

Thank you
zuzka

[Mister Micawber]

.
To give somebody a piece of my mind = to give somebody my strong opinion or statement of my feelings about that person, or to sharply criticize or reprimand that person.
.
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Native English teacher at Mister Micawber's